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Front Bearing Noise? GE 49x491  Rate Topic 
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 Posted: Wed Sep 12th, 2012 10:34 am
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NM Whitney Jr.
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Need some help folks... My favorite fan GE 49x491 has developed a rattle that's coming from the front bearing. It almost sounds like rattling dice, but it's more metallic. It's also wildly intermittent. At times it's nearly constant and at others the fan will go several oscillations with no noise at all. Rattle comes and goes whether the oscillation gear is engaged or not.

I have pulled the blade and front cover off and confirmed that the bearing itself isn't loose. There are some scratches on the interior of the bearing, but no cracks I can see. I recently replaced the oil wicks and confirmed all of the raceways and drain holes are open and clear.

It rattles whether or not the blade is on.

The shaft has about 1/16th inch of play front to back and no play up/down or side to side.

This fan is my nightly runner in the bedroom and the rattle is slowly getting worse (and driving me nutz). Any advice on what to do next?

Last edited on Wed Sep 12th, 2012 10:45 am by NM Whitney Jr.

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 Posted: Thu Sep 13th, 2012 10:46 am
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NM Whitney Jr.
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Anyone... Bueller?

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 Posted: Thu Sep 13th, 2012 12:37 pm
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Ron Powell
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NM, If there isn't any play anywhere I see it hard to make a rattle.
Not knowing the GE numbers I'm going to assume this is a small GE with the self center bearings so I'd check to see if the front bearing is in tight. These are held in by a threaded ring of sorts and if it were to loosen up too much would cause the bearing to chatter. Spin the ring tight but not too tight because it'll bind it, just snugged down so that the bearing still swivels like an eye socket, if it isn't already. If it has a sleeve bearing.....well, I don't know what to tell you unless your oil cup is rattling loose.

Oh, just to check, turn the fan upside down while running and see if the rattling stops.

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 Posted: Fri Sep 14th, 2012 06:53 pm
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NM Whitney Jr.
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Ron,
Here is a pic of a 49x491.

I'll go back into the fan this weekend and see if the spin ring you described is loose.

Even though the fan had been running all night, I went ahead and gave it the "upside down" treatment (incurring some odd looks from my wife and children as I did so).  For the first minute there was no bearing noise.  Then it slowly started back with the intermittent rattle.  I held it for another minute or so and then put it back on the dresser (right side up).  I let the fan run while I finished getting ready for work (another 15 min).  During that time, the rattling sound was reduced in volume and frequency by at least half.

Hmmmm...

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 Posted: Fri Sep 14th, 2012 07:22 pm
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Ron Powell
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Yep, that's one of those cantankerous little guys, they can be very temperamental.
You might check to make sure it's not the cage and or the badge rattling also.
The halo the motor rides in can also rattle if the adjusting screw on the top is not properly adjusted. If you can pick up on the motor and it has any vertical slop within the halo it needs to be adjusted. Loosen the brass nut that holds the screw in place and tighten the screw till all
vertical slop is gone, then back the screw off about a 1/4 turn and tighten the nut down making sure the screw doesn't turn when doing so. If you've had this apart before you should have had a small ball bearing and a spring that goes into the top of the motor housing where the halo meets it, if not you need to find a good stiff spring that will fit in it. The spring keeps tension where the motor housing and halo meet keeping it fairly snug without rattling, otherwise the screw will adjust way too far into the motor housing and you may not even be able to put the lock nut back on.

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 Posted: Fri Sep 14th, 2012 07:44 pm
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John Fengel
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To add to what Ron recommended, I have 1 like yours and 3 Quiet Blade Pedestals and they can "rattle". What I've found is originally GE used a "wavy washer" on the Rotor Shaft in addition to the Fiber Washers and if you replace the Wavy Washer with regular Fiber Washers and adjust the end play of the Rotor it will quiet them down a lot.
Hope this helps.
John

Last edited on Fri Sep 14th, 2012 07:45 pm by John Fengel

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 Posted: Thu Oct 12th, 2017 10:21 pm
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Joe DeVoe
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I have a 49x491 and was wondering if you ever removed the base, yoke from case? I know there are bearings inside this yoke but can't remember how to get it off from the motor case.

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 Posted: Fri Oct 13th, 2017 08:14 pm
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NM Whitney Jr.
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Holy Thread Resurrection Batman!

FWIW, I never tried to separate that particular bearing housing.

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 Posted: Sat Oct 14th, 2017 11:56 pm
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Kevin Massey
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I would check and make sure the bearing retainer is tight. I had a loose retainer on a front AOU bearing. I got lots of chatter. Tightened it up and noise went away.

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